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For reporting web pages that need to be upgraded to support web standards and Gecko-based browsers. And for reporting add-ons that exhibit common problems that make Firefox run sub-optimally. (more info)

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Created attachment 8859585[details]
ica.cer
User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Build ID: 20170323105023
Steps to reproduce:
I have visited a webpage where the public certificate which is signed by certum.pl ica.
Certum.pl is a trusted CA, but there is an intermediate ca missing.
Please send pn for an example web site.
Actual results:
A warning is appearing that a certificate is missing
Expected results:
The public certificate should be trusted, because the certum.pl CA is trusted

Why do you think this is not the site configuration issue?
https://www.ssllabs.com/ssltest/analyze.html?d=prox06.ho2.de
* This server supports weak Diffie-Hellman (DH) key exchange parameters. Grade capped to B. MORE INFO »
* This server's certificate chain is incomplete. Grade capped to B.
I don't know if we have plans to make an improvement.